I'm new to lammps and I have a very basic question and couldn't find an
answer anywhere. I must be doing something wrong somewhere.
I am loading a single particle from a file and want to scale its
diameter by two.
compute a all property/atom radius
variable b equal 4*c_a
set atom 1 diameter b
and get the error message:
ERROR on proc 0: Fix nve/sphere requires extended particles
So I guess the compute or variable command is wrong and there is no
numeric value stored in "a".